Unit 1 Review

Square Numbers• A square number is a number that has the same

numbers for its dimensions.

Composite Numbers• A composite number has more than 2 factors and

more than 1 array.• Arrays for the number 12

Prime Numbers

• A prime number is a number with only 2 factors, 1 and itself.

Is the number square, composite, or prime?

Draw as many arrays as possiblefor these numbers.16

7

24

Answers

• 16 SQUARE (4 x 4)

• 7 PRIME (1 x 7)

• 24 COMPOSITE (1 x 24, 2 x 12, 3 x 8, 4 x 6)

Factors

• A factor is the number you skip count by. It is also all of the numbers that can divide evenly into a number.

Factors of 20:1, 2, 4, 5, 10, 20

Factors

• Find the factors of the following numbers:

15

32

28

Factors

15(1, 3, 5, 15)

32(1, 2, 3, 4, 8, 16, 32)

28(1, 2, 4, 7, 14, 28)

Factors

• Use the diagram to help you identify 2 factors of 15.

Factors

• Use the diagram to help you find 2 factors of 54.

Factors

• Which of these is not a factor of 100.A. 25B. 40C. 50D. 10

Factors

• Which of these is not a factor of 300.A. 30B. 25C. 100D. 40

Factors

• Which of these is not a factor of 500.A. 50B. 30C. 100D. 25

Multiples• A multiple is a number that you land on when

you skip count by a number. It is the number you count by or a larger number.

Multiples of 4:4, 8, 12, 16, 20, 24, 28

Multiples

• Find the multiples of the following numbers.

3

8

12

Multiples

Multiples of 3:(3, 6, 9, 12, 15, 18, 21, 24)

Multiples of 8:(8, 16, 24, 32, 40, 48, 56)

Multiples of 12:(12, 24, 36, 48, 60, 72, 84)

Multiplication

• Draw an array to help solve this problem.

Dan has 8 baskets. He puts 9 books in each basket. How many books does he have in all?

Multiplication

• Use 2 x 500 = 1000 to answer the following problems.

4 x 500

6 x 500

8 x 500

Breaking Down Numbers

• Which one of these answers would help you break down 8 x 11?

A. 8 x 10 = 80 and 8 x 2 = 16B. 8 x 5 = 40 and 8 x 5 = 40C. 8 x 10 = 80 and 8 x 1 = 8D. 8 x 12 = 96 and 8 x 2 = 16

Multiples

• Which equation represents 5 people counting by 6s?

A. 5 x 6B. 30 x 1C. 6 + 5D. 6 - 5

Multiples

• Which equation represents 3 people counting by 9s?

A. 3 + 9B. 9 - 3C. 27 x 1D. 3 x 9